Klem — Revision of the Palaeozoic Palae'echinoidea. 61 



han's Bay and St. John's Point, Dunkineely; Malahide, 

 Malahide; l'Ardoisiere, France; Hunsriickenwald, Ober- 

 Elsass. 



26. Archaeocidaris vetustus Phillips. 



1836. Cidaris vetusta. Phillips, Geol. Yorkshire, p. 208. 



1843. Cidaris vetusta. Portlock, Geol. Rep., p. 353, pi. 16, 

 fig. 11. 



1844. Echinocrinus vetusta. M'Coy, Foss. of Ireland, p. 174. 

 1862. Archaeocidaris vetusta. Dujardin et Hupe', Echino- 



dermes, p. 466. 

 1874. Archaeocidaris vetusta. Love'n, Kongl. Svens. Vet- 

 ens. Akad. Handl., Bd. 11, no. 7, p. 43. 



Ring at the base of the spine sharp and strongly milled. 

 Spines tapering with strong prickles which alternate. No 

 longitudinal striae. Prickles separated considerably. Plates 

 have a simple border of granules. 



Geological formation and locality : Carboniferous Lime- 

 stone, Florence Court, Ravenstonedale, Northumberland; 

 Coalbrookdale, Whitewell; Hook Head, Fethard; Tyrone; 

 Fermanagh . 



27. Archaeocidaris wortheni Hall. 



1858. Archaeocidaris icortheni. Hall, Geol. Iowa, vol. 1, 



pt. 2, p. 700, pi. 26, figs. 4 a-g. 

 1867. Archaeocidaris icortheni. Dana, Man. Geol., p. 312, 



fig. 533. 



1874. Archaeocidaris Wortheni. Loven, Kongl. Svens. 

 Vetens. Akad. Handl., Bd. 11, no. 7, p. 43. 



1875. Archaeocidaris Wortheni. Quenstedt, Petref. 

 Deutschl., Bd. 3, Abth. 1, p. 372, tab. 75, fig. 10. 



1884. Archaeocidaris cf. icortheni. Walcott, Pal. Eureka 



Dist., p. 212. 

 1889. Archaeocidaris wortheni. Miller, N. Amer. Geol. Pal., 



p. 225. 

 1894. Archaeocidaris wortheni. Keyes, Mo. Geol. Surv., 



vol. 4, p. 128, pi. 16, figs. 3 a, b. 



